Friedrici-i andrjj



(No Model.)

I F. ANDRE. WOOD PULP GRINDING MACHINE.

No. 503,304. AL 0 Patented Aug. 15, 189 3.

W s T04:

IT/vEss 1 m V Mf r E ren/ways.

UNITED STATES PATENT OFFICE.

FRIEDRICH ANDRE, OF HILDESHEIM, GERMANY.

WOOD-PULP-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 503,304, dated August15, 1893.

Application filed April 22, 1893. serial No. 471,408. (No model.)

To all whom it may concern.-

Be it known that I. FRIEDRICH ANDRE, a subject of the King of Prussia,and a resident of Hildesheim, Germany, have invented certain new anduseful Improvements in Wood- Pulp-Grinding Machines, of which the following is a specification.

The horizontal wood pulp grinding machines used heretofore were soconstructed and operated that the water, necessaryin the process ofgrinding, was conducted upon the upper surface of the stone and runoutof the apparatus with the pulp ground off the block of wood. Inmachines of this kind, parts of pulp ground from the blocks are carriedto the followingblock, and are there again ground and disintegratedwhereby their fibrous nature is destroyed and the quality of the pulp isdeteriorated.

In my improved wood pulp grinding machine, these difficulties areavoided by mounting the horizontal stone in such a manner that duringthe operation the same is entirely under water, and the particles ofpulp, as soon as ground from the block, immediately rise to the surfaceof the Water and are carried off with the same. Much less water is usedthan with the old machines used heretofore which is a matter ofconsiderable importance, especially where the water is scarce.

My improved apparatus can also readily be adjusted to operate in thesame manner as ordinary grinding machines, in which the water isadmitted at the top and runs olf at the bottom.

My invention further consists in providing the grinding-stone with meansfor lifting and lowering it on its vertical axis and thus permitting ofusing the stone until the same is almost entirely worn off.

In the accompanying drawings, Figure 1 is a vertical transverse sectionof my improved wood pulp grinding machine. Fig. 2 is a plan View of thesame.

Similar letters of reference indicate correspondin g parts.

On the vertical rotative shaft 7 the grinding-stone s is supported. Thesame is surrounded by the water-tight compartment Z, provided with aclosed bottom. In the top of said compartment, compressor boxes a a withtheir followers are arranged. The water is conducted to thegrinding-stone through the pipes 11 b at the bottom or at any other partof the compartment Z the water rising to the 5 top of the grinding-stoneso that the latter is at all times fully surrounded with water. Thewater and the pulp flow off through the pipe f at the top of thecon'ipartinent Z. The pulp as soon as ground from the blocks rises tothe surface of the water and passes off with the same through the pipef. If the apparatus is to be operated in the usual manner, that is, thewater conducted to the top, the pipes 11 b can be closed and the wateris admitted through the pipe 0 at the top. The wood pulp and the waterthen pass to the bottom of the compartment Z and pass into the pipe ewhen the gated is raised. An iron ring rsupporting the grinding-stonerests on the bottom flange of a tube It surrounding the shaft \V. A setscrew 19 is screwed through the top of said tube, its lower end restingon the upper end of said shaft W. By turning the screw 19 the tube hwith the ring 0' and the grinding-stone s on the same can be raised, asthe stone wears off.

The apparatus is also provided with a device for sharpening the grindingedges of the stone which consists of a box 0: containing an abradingsubstance or material which is pressed upon the stone by means of asuitable hand-wheel.

Having thus described my invention, I claim as new and desire to secureby Letters 8 Patent-- 1. In a Wood pulp grinding machine, thecombination, with a grinding-stone mounted to rotate in a horizontalplane, a compartment surrounding said grinding-stone, means forconducting Water into the bottom of the compartment and drawing it olffrom the top, substantially as set forth.

2. In a wood pulp grinding machine, the combination, withagrinding-stone mounted to rotate in a horizontal plane, a compartmentsurrounding the stone, pressure-boxes and followers in the top of thecompartment, an inlet for water at the bottom of the compartment, and anoutlet for the water at the top of the compartment, substantially as setforth.

3. In. a wood pulp-grinding machine, the

combination, with a grinding stone mounted In witness whereof I havehereunto set my to rotate in a horizontal plane, a compartment hand inpresence of two witnesses. surroundin the stone pressure boxes and 1w v'1 followers on the top of the compartment, and RIEDRHH ANDRE 5 inletsand outlets for the water both at the Witnesses:

top and bottom and a gate for controlling the ERNST BARNSTORF,

bottom water outlet, substantially as set forth. W. 13. MURPHY.

